Drill-machine



(No Model.)

J. G. MURHEAD;

l DRILL MACHINE. l No. 341,813.v Pacmtedv Mawv 11, 18186.

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JOHN O. MUIRHEAD, OF GRUB GULOH, CALIFORNIAY DRILL-MACHINE.

' PEGIFICATION forming part of Letters Patent. No. 341,813l dated May 11, 1886.

(No mode.)

To all whom it may concern:

Be it known that l, JOHN C. MUIRHEAD, of Grub Guleh, Fresno county,`State of California, have invented an Improvement in Drills; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to certain improvements in drills; and it consists in the combination of devices, which will be more fully explained by reference to the accompanying drawings, in which- Figure l is a perspective view showing the drill and its support, together with the oper` ating-treadle- Fig. 12 is a side elevation with a section showing the rotating device. Fig. 3 is a section taken through the clamp.

A is the standard, which is fixed at any desired angle or position within the tunnel, shaft, or at any other point where work is to be done, by means of a ratchet, screw, or other device for producing the proper tension. Upon this standard is clamped a plate or frame, B, from which the drill is supported'as follows: C is a slide,whieh is dovetailed, tongued,or otherwise `iitted to move in corresponding grooves in the clampplate, and a socket is formed in this slide and inthe corresponding plate, in which a beveled head, D, formed on the end of the arm E, is `iitte'd. Vhen the clamp C is forced down in its guides upon the head D, it clamps it rmly in any position which it may occupy by means of screw-bolts or nuts F. Uponthe outer end of the arm E is a j ournalbox or support, H, having caps I, within which the journals of the ratchet J turn. The caps I may be hinged at one end, so as to be turned backward about their hinges, and may be secured by nuts or bolts at the opposite end when they are closed over the journals. The ratchet and its journals are made hollow, the interior being shaped to fit the exterior of the drill, which is usually made of six or eight sided or other polygonal steel. The ratchet and journals are also made in two halves, which may be separated when the caps of the box I are thrown back, so as to allow the drill to be laid in its place, after which they are put together and the caps secured over them, when the ratchet may be turned, thus rotating the drill with it. By this construction any drill may easily be placed in the device with but little trouble,

and the expansion of the drill-point or the battering up ofthe head by the blows upon it will not interfere with the drill being introduced or taken out.

In order to rotate the drill and the ratchet, a movable pawl, K, is iitted to slide in a guide, L, which extends down at one' side ot' the box H, as shown. A spring, M, is fitted iixedly within thisguidebomaud tends to force the pawl K upward, so that the projecting endor hook will engage a tooth ofthe ratchet J wheneverit has been raised vabove the tooth. From the lower end ofthe shank of this pawl a cord, wire, or chain, N, extends downward, and is connected with the arm or lever O, one end of which is pivoted to a clamp or arm, P, which is adjustable on the standard A. The other end of the lever O has a foot or pedal, Q, upon which the operator may place his foot, thus pulling downward upon the cord N and the pawl K, and this acts. to turn the ratchet J, and with it the drill, a partial revolution, the amount of turn being dependent upon the number of teethand the arrangement of the ratchet.

In order to operate this device readily, whatever angle the drill may stand at, I have ixed two anti-friction rollers, R, in the lower part of the guide L, so that the cord N may work freely over these rollers when the drill is be ing operated in a direction not at right angles with the movement of the treadle-lever O.

By means ofthe arm E and the head D the drill may be turned so as to operate in any position, from a vertical downward to a verti cal upward.

Vhen the miner desires to work with this drill, he strikes upon the end of it, the point resting against the rock inline with the direction in which it is desired to make a drillhole.. As he strikes, he presses his foot upon the treadle Q, and thus rotates the drill slightly an instant before the blow falls upon the head of it. In this manner one man can easily drill a hole which would ordinarily take two men. Vhen drilling in an upward direction, it is necessary to hold the drill so that it will not fall back, and this is done by means of a pawl, S, the point of which presses upon the side of the drill sufficiently to hold it, this pressure being caused by spring T, acting upon IOO its opposite end. The pawl S is fulcrumed in p a sleeve or frame, U, which is fixed so as to turn loosely upon the projection of the jouring this pawl S and its support.

nal which holds the ratchet, so that the drill may be turned without displacing or derang- If the drill 1s being operated downward, it will be necessary to raise it slightly after the blow, in order to allow it to turn, and this may be done by a weighted arni orlever7 V, having a connection wlth the drill by means of a sleeve, WV, surrounding it, so as to bind against and lift it by the action of the weight or other suitable device, which would act as a clamp to raise the drill after each blow.

IfIaving thus described my invention, what I clann as new, and desire to secure by Letters Patent, is-

l. In a drill7 the supporting-slandard and adjustable sliding plate, which may be clamped `to it at any point in its length, said plate having a semi socket or chamber to receive the lower part of the head of the drillsupporting arm, in combination with a dovetailed or channeled slide moving in corresponding guides in the plate, so as to fit over the upper portion of the head, and screws or bolts, by which it may be clamped or tightened upon said head, substantially as herein described.

2. Adrill-supporting frame having an arm projecting to one side therefrom and a beveled or other suitable-shaped head at the end of the arm, in combination with a plate having a socket inclosing one half of said head and a slide chainbered to inclose the other half,and Inovingin guides upon the first plate, together with screws orbolts, by which it may be forced down so as to clamp the head, subI Stantially as herein described.

3. In combination with the rotary sleeve formedlupon its exterior surface, a pawl the shank of which moves in a guide at one side, so that the pawl will engage the ratchet, a treadle connected with the pawl-shank, so that it may be drawn downward by the action of the treadle, and a spring within the pawlcase, by which it may be returned after each depression, so as' to engage another tooth in thc ratchet, substantially as herein described.

4. The rotating drill-holding sleeve having a ratchet formed upon its exterior surface, the guide L, the pawl reciprocating within the guide, the operating-treadlc, and a connection between the treadle and pawl, in combination with the guiderollers R, journaled within the guide L, whereby the lower end of its pawl moves between said rollers, substantially as herein described. Y

5. The rotary ratchet-sleeve and the drillshank having a longitudinal movement within it while being rotated simultaneously, in conibination with the pivoted arm or pawl S, pressing against the side ofthe drill-shank so as to hold it and prevent its dropping when in a vertical position with the point upward, substantially as herein described.

(5. The drill-shank and the inclosing-sleeve by which it is rotated, in combination with a binding-ri ng surrounding the drill-shank and a weighted arm or lever, Y, pivoted to said ring,- and having a fulcrnni or a projection from the drill-frame, whereby the drill is raised after each blow when the point is downward,

substantially as herein described. 7

JOHN C. MUIRHEAD.

Witnesses:

PETER GILDAY, A. B. ANDERSON. 

